<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>递增运算符练习</title>
    <script>
        var a = 10;
        ++a;            //11
        var b = ++ a +2;    //12 + 2 
        console.log(b);     //14

        var c = 10;
        c++;            //11
        var d = c++ + 2;    //11 + 2
        console.log(d);     //13

        var e = 10;
        var f = e++ + ++e;   //10 + 12
        console.log(f);      //22
        // 后置自增 先表达式返回原值 后面变量再自加1
    </script>
</head>
<body>
    
</body>
</html>